The best vitamin K2 for women depends on the formula your clinician considers appropriate and the format you prefer. For adults who have already discussed supplementation, our shortlist compares NOW MK-7 for a vegan capsule, Jarrow MK-7 for a softgel, and NOW D3 & K2 when added vitamin D is also wanted. These are label-based shopping choices, with no hands-on testing or proven health ranking.
Check medicines before buying. Vitamin K can seriously interfere with warfarin and similar vitamin K antagonist anticoagulants. If you take one, do not start, stop or change a K2 supplement without your anticoagulation clinician’s guidance; changes in vitamin K intake can alter treatment. Review other medicines with a pharmacist or clinician too.
These choices are for adults. If you are pregnant, breastfeeding or have a medical condition, ask your clinician before using them. The manufacturers specifically advise consultation in these situations. A general supplement shopping list cannot establish whether a product is appropriate during pregnancy or lactation.
Vitamin K2 supplements compared
Amounts below describe one label serving. They are not recommended personal doses. Check the exact bottle size, Supplement Facts and directions when ordering, because similarly named products can contain different forms or additional nutrients.
| Product and bottle | Label serving | K2 per serving | Added vitamin D | Best fit within this shortlist |
|---|---|---|---|---|
| NOW MK-7 Vitamin K2, 60 veg capsules | 1 veg capsule | 100 mcg, MK-7 | None listed | Vegan capsule without added D3 |
| Jarrow MK-7, 90 mcg, 60 softgels | 1 softgel | 90 mcg, MK-7 | None listed | Softgel; contains bovine gelatin |
| NOW Vitamin D3 & K2, 120 capsules | 1 capsule | 45 mcg, MK-4 | 25 mcg (1,000 IU), D3 | Combined formula when both nutrients fit your plan |
1. NOW MK-7 Vitamin K2: vegan capsule without added D3
This is the most straightforward option here if you want a vegan capsule and do not want to add vitamin D. The manufacturer’s label lists 100 mcg of K2 as menaquinone-7, also called MK-7, in one veg capsule. The selected bottle contains 60 capsules, and vitamin K2 is the only nutrient listed in its Supplement Facts panel.
Choose it for that format and ingredient profile only if the amount fits your clinician’s advice. The larger number on the label does not establish better results than the other choices. Check that you are ordering the 100 mcg MK-7 version.
NOW MK-7 Vitamin K2 100 mcg, 60 Veg Capsules
As an Amazon Associate we earn from qualifying purchases.
2. Jarrow MK-7: softgel without added D3
For someone who prefers a softgel, Jarrow’s 90 mcg MK-7 provides a different format without added vitamin D. Its label serving is one softgel, and the selected listing is the 60-softgel bottle. The current ingredient list includes bovine gelatin, so this is unsuitable for a vegan preference.
The 90 mcg amount is a product specification, not a women’s K2 requirement. This is an alternative to the capsule above when the format and formulation suit you; we have not established that either product works better for bone or heart outcomes.
3. NOW Vitamin D3 & K2: a conditional combination choice
Consider this combination only when both nutrients belong in your supplementation plan. The current NOW label lists 45 mcg of K2 as MK-4 and 25 mcg (1,000 IU) of vitamin D3 per one-capsule serving. The selected bottle has 120 capsules. It contains MK-4 rather than the MK-7 in the two choices above.
Its main tradeoff is the fixed combination: adding K2 also adds D3. Count that vitamin D alongside any multivitamin or separate D supplement. A cellulose capsule does not by itself establish that the whole formula is vegan, and we do not classify this combination as vegan.
What the evidence means for buying K2
Vitamin K contributes to normal blood clotting and bone function. That does not establish that every woman needs a K2 supplement. The NIH Office of Dietary Supplements says deficiency is uncommon and that research on supplements for osteoporosis and heart-disease prevention remains inconclusive. Supplements should not replace an osteoporosis or cardiovascular treatment plan.
The studies also differ. A trial of 244 healthy postmenopausal women found less bone loss at some measured sites with MK-7, but not at the total hip. A three-year trial of 142 women with osteopenia, in which both groups received calcium and vitamin D, found no bone-density difference between MK-7 and placebo. These results do not establish that the retail products above prevent fractures.
Claims about directing calcium, protecting arteries or providing all-day protection should not decide your purchase. NIH describes vitamin K’s role in arterial calcification and coronary disease risk as unresolved. The FDA also explains that dietary supplements are not approved before marketing. A supplement label or a manufacturing-quality statement is not evidence of a proven clinical benefit.
How to choose the right bottle
- Match the form and amount to your plan. Look for MK-4 or MK-7 on the actual Supplement Facts panel. Do not use the microgram numbers as an effectiveness ranking or assume the two forms are interchangeable in a prescribed regimen.
- Check the whole formula. Review added D3, other supplements you take, capsule ingredients and allergy information. A product called a vitamin K supplement can have a different nutrient mix from another bottle with a similar name.
- Compare the exact variant. Match the name, strength and count shown here. Check the seller, expiry information and return terms, then compare cost for the amount your clinician recommends. This guide does not promise the lowest price or current availability.
Common questions
How much vitamin K2 should a woman take?
There is no separate established K2 intake target in the NIH intake guidance. The adequate intake of 90 mcg a day for women aged 19 and over refers to total vitamin K intake, including food. It is not a prescription to add 90 mcg of K2. Ask your clinician whether supplementation is needed and, if so, which form and amount to use.
Is MK-7 better than MK-4?
Neither is a universal winner. NIH notes limited evidence comparing absorption across supplement forms. A form or amount on the label does not establish that a particular retail product prevents disease or offers 24-hour protection. Choose the form specified in your individual plan.
Should K2 always be paired with vitamin D3?
Choose a combined product only when the added D3 is appropriate. NIH lists an adult vitamin D upper limit of 100 mcg (4,000 IU) a day from food, drinks and supplements together; this is a safety limit, not a daily goal. A 5,000 IU supplement exceeds it on its own. Clinicians sometimes prescribe higher amounts for a defined period to treat deficiency. See the NIH vitamin D guidance.
Can I use K2 if I take a blood thinner?
Get advice from the clinician managing your medication before buying or changing a K2 supplement. The serious vitamin K interaction is established for warfarin and similar vitamin K antagonists. Have your exact medicine checked even if it is not warfarin.
Are these suitable during pregnancy or breastfeeding?
These are not prenatal recommendations. The product warnings call for professional advice during pregnancy or breastfeeding. Your prenatal clinician should review the full formula and any overlap with a prenatal supplement before you use one.
